$F30F/62223: Find File
Jump from $F20E, $F250, $F351:
F30F: A9 00 LDA #$00
F311: 85 90 STA $90 ; Kernal I/O Status Word ST
F313: 8A TXA
Jump from $F291:
F314: A6 98 LDX $98 ; Number of Open Files/Index to File Table
Jump from $F31C:
F316: CA DEX
F317: 30 15 BMI $F32E ; Set File values
F319: DD 59 02 CMP $0259,X ; Active logical File numbers
F31C: D0 F8 BNE $F316
F31E: 60 RTS
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